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package koushin
import (
"fmt"
"net/http"
"net/url"
"strings"
"time"
"github.com/labstack/echo/v4"
)
const cookieName = "koushin_session"
const messagesPerPage = 50
type Server struct {
sessions *SessionManager
imap struct {
host string
tls bool
insecure bool
}
smtp struct {
host string
tls bool
insecure bool
}
plugins []Plugin
}
func (s *Server) parseIMAPURL(imapURL string) error {
u, err := url.Parse(imapURL)
if err != nil {
return fmt.Errorf("failed to parse IMAP server URL: %v", err)
}
s.imap.host = u.Host
switch u.Scheme {
case "imap":
// This space is intentionally left blank
case "imaps":
s.imap.tls = true
case "imap+insecure":
s.imap.insecure = true
default:
return fmt.Errorf("unrecognized IMAP URL scheme: %s", u.Scheme)
}
return nil
}
func (s *Server) parseSMTPURL(smtpURL string) error {
u, err := url.Parse(smtpURL)
if err != nil {
return fmt.Errorf("failed to parse SMTP server URL: %v", err)
}
s.smtp.host = u.Host
switch u.Scheme {
case "smtp":
// This space is intentionally left blank
case "smtps":
s.smtp.tls = true
case "smtp+insecure":
s.smtp.insecure = true
default:
return fmt.Errorf("unrecognized SMTP URL scheme: %s", u.Scheme)
}
return nil
}
func newServer(imapURL, smtpURL string) (*Server, error) {
s := &Server{}
s.sessions = NewSessionManager(s.connectIMAP)
if err := s.parseIMAPURL(imapURL); err != nil {
return nil, err
}
if smtpURL != "" {
if err := s.parseSMTPURL(smtpURL); err != nil {
return nil, err
}
}
return s, nil
}
type context struct {
echo.Context
server *Server
session *Session
}
var aLongTimeAgo = time.Unix(233431200, 0)
func (c *context) setToken(token string) {
cookie := http.Cookie{
Name: cookieName,
Value: token,
HttpOnly: true,
// TODO: domain, secure
}
if token == "" {
cookie.Expires = aLongTimeAgo // unset the cookie
}
c.SetCookie(&cookie)
}
func isPublic(path string) bool {
return path == "/login" || strings.HasPrefix(path, "/assets/") ||
strings.HasPrefix(path, "/themes/")
}
type Options struct {
IMAPURL, SMTPURL string
Theme string
}
func New(e *echo.Echo, options *Options) error {
s, err := newServer(options.IMAPURL, options.SMTPURL)
if err != nil {
return err
}
s.plugins, err = loadAllLuaPlugins(e.Logger)
if err != nil {
return fmt.Errorf("failed to load plugins: %v", err)
}
e.Renderer, err = loadTemplates(e.Logger, options.Theme, s.plugins)
if err != nil {
return fmt.Errorf("failed to load templates: %v", err)
}
e.HTTPErrorHandler = func(err error, c echo.Context) {
code := http.StatusInternalServerError
if he, ok := err.(*echo.HTTPError); ok {
code = he.Code
} else {
c.Logger().Error(err)
}
// TODO: hide internal errors
c.String(code, err.Error())
}
e.Use(func(next echo.HandlerFunc) echo.HandlerFunc {
return func(ectx echo.Context) error {
ctx := &context{Context: ectx, server: s}
ctx.Set("context", ctx)
cookie, err := ctx.Cookie(cookieName)
if err == http.ErrNoCookie {
// Require auth for all pages except /login
if isPublic(ctx.Path()) {
return next(ctx)
} else {
return ctx.Redirect(http.StatusFound, "/login")
}
} else if err != nil {
return err
}
ctx.session, err = ctx.server.sessions.Get(cookie.Value)
if err == ErrSessionExpired {
ctx.setToken("")
return ctx.Redirect(http.StatusFound, "/login")
} else if err != nil {
return err
}
ctx.session.Ping()
return next(ctx)
}
})
e.GET("/mailbox/:mbox", handleGetMailbox)
e.GET("/message/:mbox/:uid", func(ectx echo.Context) error {
ctx := ectx.(*context)
return handleGetPart(ctx, false)
})
e.GET("/message/:mbox/:uid/raw", func(ectx echo.Context) error {
ctx := ectx.(*context)
return handleGetPart(ctx, true)
})
e.GET("/login", handleLogin)
e.POST("/login", handleLogin)
e.GET("/logout", handleLogout)
e.GET("/compose", handleCompose)
e.POST("/compose", handleCompose)
e.GET("/message/:mbox/:uid/reply", handleCompose)
e.POST("/message/:mbox/:uid/reply", handleCompose)
e.Static("/assets", "public/assets")
e.Static("/themes", "public/themes")
return nil
}
|
